I initially bought this module to bring microphones and guitars up to eurorack levels. But I have now discovered that this module offers so much more.
For starters the mini mult on the audio out is most welcome as I very often want to route the signal to more than one place (saving my multiples for other signals in the patch). The envelope follower is also surprisingly useful routed to an amp, filter or to control an aspect of a wave multiplier or vocoder are my most common choices. I can derive interesting rhythms from an external drum machine and use the gate threshold as a performance control to change the rhythm. The LEDs also offer useful indication of the overdrive, envelope follower and gates (and we all like flashing lights!)
There is only one slight criticism I would have, the module could have fitted into 6HP for this reason only I have knocked off one star in features. (I'm trying to build my system into a small case so every HP counts!)
All in all an excellent, versatile and most useful module. I use it in far more of my patches than I ever expected to.